Thin-place detector for filling-replenishing looms.



L. DUNAWAY. I THIN PLACE DETECTOR FOR FILLING EEPLENISHING LOOMS.

APPLICATION FILED JUNE 15, 1908.

Patented Oct. 18, 1910.

4 8HBETS-SHEET 1.

IN VEN TOR.

WITNESSES L. DUNAWAY. THIN PLACE DETECTOR FOR FILLING REPLENISHING LOOMS. 7 APPLICATION FILED JUNE 15, 1908. 972,833, 4 A Patented Oct. 18,1910.

4 SHEETSSHEET 2.

'HHHIMHIMIIIMII! WITNESSES IN VENTOR.

z 2 Zyszanaer fiaaan M ATTORNEY.

L. DUNAWAY. THIN PLACE DETECTOR FOR FILLING REPLENISHING LOOMS.

Q APPLICATION FILED JUNE 15, 1908.

Patentd 0011,18, 1910.

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V L. DUNAWAY.-- THIN PLACE DBTEGTOB. FOEFILLING: REPLENISHING LOOMS.

7 APPLICATION FILED JUNE 15, 1909. I 72, 33, Patented Oct. 18,1910.

' 4 SHEETS-SEEM 4.

IN VENTOR. {yszalader ATTO RNEY.

. WITNESSES:

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LYSZANIDEB DUNAWAY, 0F ElCGT'lllLilldil, GEfiR-GIA5'ASfiIGNOR TO DRAE'ER COMPANY,

I 035: HOP EDALE, MlfiSAUHUSETTS, A CGRFQRATION OF MAINE.

THXN PLACE DETECTOR EQR FELLING-REPLENISHING LOOMS.

erases.

Specification of Lettersiatcnt.

' latented @ct. 18, 1919.

Application filed June 15, 296%. Serial No. 238,640.

To all whom it may concern:

Be it known that l, Lrsznnnnn DUNAWAY, a' citizen of the United States, residing at Scottdale, in. the county of DeKalb and State of Georgia, have invented "certain new and useful Improvements in Thin-Place Detectors for Filling-Replenishin Looms, of which the following is a speci cation.

This invention relates to thin-place detecting mechanism for looms of the lyp detector, so that the fault in the weeving will be corrected automatically.

- The inventwn 1n the preferred form will be fully described in the subjoined specification and particularly pointed out in the following claims, reference being had to the accompanying drawings, in which:

Figure lis a perspective view of a portion of a loom with one embodiment of my present invention applied thereto; Fig. 2 is a side elevation of the gearing between the take-up ratchetand the usual take-up roll; Fig. 3 is-a front view thereof; F 4: is a side view of the take-up and cloth rolls; Fig. 5 is an enlarged detail inside elevation and partial section of the latch operating device, to be referred to; Fig. 6 1S a top plan view of the mechanism shown in Fig. 5; Fig. 7 is a detail view in perspective of the thin place detector and its connections, the detector being shown in normal position resting upon the cloth adjacentthe fell;-Fig. 8 is a similar View but showing the parts in a driller-entposition; Fig 9 is a perspective detail of a piece of clothshowing a thin place; Fig. 10 is similar view, s owing the detectorun its operative position wlth its up down between the warp threads; and Fig. 11 is a perspective detail of the operative end or tip of the detector.

Referring more particularly to Fig. 1, the warpbeam is represented'at' 1, the warp threads 2 passing therefrom to the harnesses 3, 4 by the verticalreciprocation of which the shed is Formed. the shuttle travelin throughthe open shed to lay the filling, all in well known manner.

The lay 5, hand-rail 6, reed 7 shuttle-box 8 at one end of the lay, the shuttle 9 provided-with a quill or bobbin 10, and the piclrer sticlr 11, are and may be of well known construction and in themselves form no part of my present invention, the shuttle in practice being of the type adapted for the automatic reception and BIQGCtlOIL of the 1511- or bobbin.

ing-carrier ly inv on is particularly adapted for use in so- Northrop looms, such for instance shown and described in United States Pa. to Northrop, No. 529,940, dated Novemb 7 F7, 1894, the running filling being replcnis. ed automatically by the insertion of a fresh.- bobbin in the working shuttle when the iilling being laid by the shuttle breaks or runs out.

The back wall oflthe shuttl-box 8 is provided at its innerend with spaced fingers forming the usual grid, across'the front of which the filling ext-ends on alternate picks, said grid being located opposite a guide 13 in practice mounted on a fixed part of the loom, usually the breast-beam, the guide sustaining a forloslide 14 bifurcated at its rear end to form parallel arms 15. Pivotally mounted between said arms is the usual filling-fork, the block or head 16 thereof having depending tines 17 to pass between the bars of the grid 12 when the lay beatsup, provided the filling is. absent. When filling is present and the shuttle is in box 8 the fork will be tilted astthe lay beats up, so that the loop-like tail 18 will be raised,

whereas,if the filling is absent on this pick the fork tines will pass through the grid 12 and the tail 18 will be lowered, as shown by dotted lines, Fig. 5. The weft-hammer 19, having a foot or follower 20 which 00- operates with a cam 21, Fig. l, is vibrated back and forth in usual manner, the upper endot'the weft-hammer having the usual pivoted latch 22 slidably supported on the crossbar 23 of the fork-slide 14, the latel shoulder 24 engaging the fork-tail 18 upon detection of filling absence, so that on its forward stroke the Weft-hammer will effect; a forward movement of the slide 1 L.

At the front of the loom a starting rod 26 is mounted, see 1, whichi'stairting rod is connected, by usual mechanism not shown, with means to replenish the running shuttle with filling when said rod 26 is rocked, as in Patent No. 529,940 before referred to. The front end of the slide 14 is hooked at 27 to cotiperate with the correspondingly shaped upper end of an arm 28 fast on the starting rod, whereby the latter will be rocked by or through forward movement of the fork-slide, to cause a fresh .bobbin to be inserted in the shuttle while the spent bobbin is ejected therefrom. The cloth passes from the weaving point or fell to and around the friction or take-up roll 29 and thence to the roll 30, on which it is wound, said take-up roll being driven through a suitable train of gearing 31, Figs. 2 and 3, from the take-up ratchet 32. This ratchet is rotated step by step by a take-up pawl on a pawl-carrier 33 operatively connected with a rock-shaft 34, which latter in practice may be the lay rocker-shaft, a detent-pawl 36 being pivotally mounted on a fixed part of the loom-frame, as is usual. A slotted let-back pawl 37 is sustained on the pivot of the awl 36, and normally clicks over the teet of the ratchet as-the same is rotated, in a manner familiar to those skilled in the art. The pawl-carrier 33 is upwardly prolonged and provided with a lateral projection 38, While the detent pawl 36 has a laterally projecting pin 39 which extends across the prolongrtion of the pawl-carrier but normally out of contact therewith.

As will be understood the mechanism previously described is all of well-known construction and operation, but it has been usedfor illustration as a form of loom structure to which my present invention can be readily applied.

Upon the loom frame in front of the takeup roll 29 I mount a plate 40 provided with adjustable bearing brackets 41, in which is mounted rotatably a shaft-like part 42 of the thin-place detector, preferably made of stiff and strong wire, the part 42 being bent rearwardly at its ends to present the detector arm 43 and the operating arm 44. As best shown in Figs. 7 and 8 the detector arm 43 is preferably made in two sections, adjustably connected by a coupling, sleeve 45, so that the tip or point of the detector may be adjusted as closely as possible to the fell of the cloth without interfering with the movement of the reed, thus insuring very prompt detection of a thin place due to failure of the filling. The rear end of the rear section of the detector arm 43 is downturned at 46 and terminates in 21 depending chisel point 47, above which shoulders 48 are formed in the downturned end or finger 46. The lower edge of the chisel point, which is the detector proper, is disposed in parallelism with the warp threads so that said point is sii'pported by the threads of filling'as" the cloth is woven. When the filling is absent for one or more picks the chisel point 47 is unsupported and drops down between the warp threads until the latter engage the shoulders 48, as in Fi 10.

Between the depending finger 46 an the coupling 45 I provide the detector arm 43 with a protector 49, herein shown as a U- shaped member made of wire and pivotally mounted upon the deitector arm, the downturned legs of the protector normally bearing on the cloth. The protector is of such length that when the detector 47 rests upon the surface of the cloth the legs ofthe protector will incline forward in the direction of travel of the cloth as it is taken up, the legs resting lightly on the cloth. The rear end of the operating arm 44 is turned outward laterally at 50 to enter loosely a cam slot 5 formed in a dog or pawl 52, the free pointed end thereof being normally above and slightly in front of a shoulder 53 on the latch 22 when said latch is in. its rearmost position, Figs, 1, 5 and 7.

When the chisel-point detector 47 rests upon the cloth undernormal conditions the arm 44 will act through its lateral extension 50 to elevate the rear end of the dog 52 above the path of movement of the latch shoulder 53. At its front end said dog is pivotally connected at 54 with a bent lever 55 having its lower end formed into a hub which is loosely mounted on one end of the starting rod 26. Asleeve 56 fast on said rod is provided with one or more lateral lugs 57, Fig. 1, to enter loosely correspond ing recesses 58 in the hub. of the lever 55. When the bent lever 55 is rocked it will cause the sleeve 56 and rod 26 to be turned, such turning of the starting rod 26 effecting the desired change in the operation of the.

loom, as is usual in looms of this general type, but the recesses 58 are made somewhat wider than the cooperating lugs 57, see Fig. 1, so that when the starting rod is turned by forward movement of the fork-slide 14 there will be no forward swing of the bent lever 55, because of the lost motion between the lugs 57 and the recesses 58.

A depending arm 59 on the sleeve 56 is arranged normally to underlie the lateral extension 38 on the prolongation of the pawl-carrier 34, and the bent lever has an "arm 60 rearwardly extended from its hub and connected by a, flexible connection 61, Fig. 1, with the let-back pawl 37. A spring 62 attached at one end to a fixed part of the loom is attached at its other end to the bent lever 55 to return the latter to normal position after it has operated. Let it be assumed that the filling has broken or run out, and that for some reason, such as an accumulation of lint in the grid 12, the filling-fork is tilted just as if the filling were present. Inasmuch as. the loom continues to operate the cloth is taken up and detects the absenceof filling. lVhen the thin place in the cloth reaches the chisel-pointed detector l? the latter drops down between thc'warp threads and the shaft 42 turns to lower the operating arm 44, so that the point of the dog '52 is positioned in the path of the latch shoulder As the latch is moved forward by the weft-hannner the engaged dog 5.2 is moved with it to rock the bent lever and turn the starting rod 26, thus setting in operation the filling-replenishing mechanism. As the lever 55 thus turns the rod 26 and the sleeve 56 fast thereon the depending arm 59 engages and raises the ex tensionBS, thereby disengaging the take-up pawl 35 from the ratchet 32 and arresting take-up; Such movement of the pawl-carrier 83 causes its prolongation to engage the projection 39 and lift the detent-pawl 36 from engagement with the ratchet 32, and the let-aback pawl 37 is also disengaged from the ratchet through the movement of the arm and the connection 61. The ratchetis thus freed from the control of-the several pawls and the tension of the warp threads, which is adjusted as desired, immediately draws back the cloth to position the thin place for the proper reception of the fresh filling supplied to the shuttle by the usual replenishing mechanism. It will thus be apparent that the-detecting movee ment of the thin-place detector 47 when it drops between the warp threads brings about the operation of the filling replenishing mechanism, arrests take-up and permits retrograde movement or let-back of the cloth to permit the new filling to be laid properly-in the shed at the point where the thin place was detected, so that the beat-up of such fresh filling will be in the proper place. As the dog 52 is moved forward by the weft-hammer 19 to operate the bent lever 55 the cam slot 51' in the dog cooperates with the extension 50 to elevate the rear end of the operating arm 44, and through i the shaft-like connection 42 the detector arm support the detector 17 above and out of contact with the cloth until. weavingis resumed. At such. time the resumption of take-up causes the cloth to move forward and thereupon the protector 49 is moved into the inclined position shown in. Fig. 7, the'lower end or tip of the detector being thereby lowered to engage and rest upon the surface of the cloth. It-will be understood that when the replenishing mechanism has operated the starting rod 26 returns to normal position, restoring all parts connected therewith to operative position, the take-up, detent and let-back pawls reengaging the ratchet 32 to resume the operation of taking up the cloth.

When the starting rod 26 is turned by or through outward movement of the forkslide'lei, as will be the case when filling absence is detected by the filling-fork, it is not necessary to release the ratchet 32 from the control of the let-back pawl 37, the latter will let-back the clothfor one or two picks, say, and accordingly the lost motion or clearance between the lug 57, and the recess 58 is made sufliciently large to permit rotative movement of the sleeve 56 with the starting rod without causing the bent lever 55 to be swung forward. When, however,

thefstarting rod is operated by or through the thin-place detecting mechzinism it is desirable to'free the cloth from the take-up mechanism. and permit a more extended letback, and this is provided for by disengaging the let-back pawl 37, as .well as 'pawls 35 and 36, from the ratchet 32, as has been described. v

Were it not'forthe lifting of the thinplace detector after "its detecting movement, as hereinbefore described, the release of the cloth and its consequent backward movement would be followed by a tear or other damage bycngagement with the abnormally positioned detector, as will be manifest.

Having fully described my invention, what I claim as new and desire to secure by Letters Patent is 1. The combination, in a loom provided with mechanism to replenish filling automatically, of a thin-place detector, a normally inoperative dog operatively positioned by or through detecting action of said detector and provided with a cam slot means actuated by the dog when operatively positioned to cause the operation of the replen-i ishing mechanism, and-a direct connection between the dog and the detector said connection including a rocking arm having an outturned end loosely entering the cam slot,

to disengage the latter from the cloth when the dog actuates the means to cause filling replenishment. 4

2. In a loom, in combination, means to feed the woven fabric forward, a thin-place detector, means operated by or through dc: tecting movement of said detector to permit a rearward'movement of-the fabric, and means carried by the detector for elevating it above the normal position during such rearward movement of fabric,

3. In a loom, in combination, means to feed the woven fabric forward, a thin-place detector, means operated by or through detecting movement of said detector to permit a rearward. movement of the fabric, and a protector pivotally connected With the detector and normally engaging the fabric at a forward inclination from the pivotal support, whereby in the rearward movement of the fabric said protector will elevate the detector above its normal position.

at. In a loom, in combination, means to feed the woven fabric for and, a thin-place detector including a pivotally-mounted arm and a depending detecting member thereon normally resting on. the fabric adjacent the fell, means operated by or through downward movementof said detecting member to permit a rearward movement of the fabric, and a U-shapcd protector pivm ally mount ed on the arm and having its legs depending from said arm. and resting on the fabric, said legs normally being inclined in the di rection of movement of the fabric, rearward movement of. said fabric acting to swing the legs rearward toward an upright position to thereby elevate the arm and said detecting member above the normal position thereof.

5. The combination, in a loom provided with automatic filling-replenishing mecl1anism, of athin place detector, and means controlled thereby to cause the operatio'n ot the replenishing mechanism by or through detecting action 01 the detector, said means including a pivotally mounted and longitudinally movable dog having a cam-slot therein, and a member coilperatil'ig with the camslot and connected with the detector, longitudinal movement oi the dog to cause filling replenislnncnt actingthrough the cam-slot and said cooperating member to elevate the detector from detecting position.

6. The combination, in a loom-provided with automatic filling-replenishing mechanism, take-up mechanism, a thin-place de tector, a filling-fork, means controlled by detecting action of the thin-place detector to release the cloth from the control of said take-up mechanism and to cause the operation of the replenishing mechanism, and

other means operated by or through detection of filling absence by the fork to cause the operation of the replenishing mechanism and effect a limited release of the cloth from the control of said take-up mechanism.

' 7. The combination, in a loom provided with automatic filling-replenishing mechanism, take-up mechanism, including takeup, detent, and let-back pawls, and a takeup ratchet with which said pawls normally engage, a fillingefork, a thin-place detector, means operated by detecting action thereof to disengage all of said pawls from the ratchet and thereby permit maximum letback of the cloth, and other means operated by detection of filling absence by said fork to disengage thetake-up and detent pawls from the ratchet while the latter remains under the control of the let-back pawl, to thereby permit a limited let-back of the cloth, the replenishing mechanism being actuated when either of such means is operated.

SI In a loom, in combination, take-up mechanism for the cloth, means to release the cloth from the control of such mechanism and permit let-back of-the cloth, a thin place detector, means pivotally connected with the detector and actuated by the movement of the cloth when let-back, to elevate the detector above its normal position and maintain it elevated until the take-up mechanism resumes control of and effects forward" movement of the cloth, and mechanism actuated by or through detecting action of said detector to effect the operation of the means for releasing the cloth from the control of the take-up mechanism. V

In testimony whereof I afiix my signature in presence of two witnesses. v

.LYSZANDER DUNAWAY. Witnesses HARRY M. PASCHAL,

'CI-nis. D. MCKINNEY. 

